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What I'd like to know is how I can retrieve the path where the script file is located in the server.
Eg: /wwwroot/blahblahblah/myphpfile.php. I know this can be done in ASP using Server.MapPath() but I don't know how to do it in PHP.

Yes, outputs itself very neatly too, probably one of the most useful features I've found since I started playing with PHP. Great when you want to set up your own box for development, and make sure the environment matches the one you're going to publish to on the web. Makes it very easy to see just how PHP is set up on the server even if you don't have any way to access the actual configuration files.